You can get Three Omnicon tokens a day by completing the Arsenal Dailies. You can trade them in to Mustang, hes in the gamescom coloured Arsenal frame next to the arcporter, for the following
I'm not sure if Omnicon runs for 4 or 5 days so you could have either a total 12 or 15 tokens

Omnicon warpaint (which is the gamescon warpaint), Omnicon Decal, Silver token, Arc Runner Title, Gun Show Title.
(the warpaint and the decal are also in the gamescom code pack which included 120 red beans)